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Interstate 40 in Tennessee runs from west to east, from the Mississippi River at the Arkansas border to the Blue Ridge Mountains at the North Carolina state line. At 455.28 miles (732.70 km), the Tennessee segment of I-40 is the longest of the eight states through which it passes and the state's longest Interstate Highway. Paralleling the older U.S. Route 70 corridor, I-40 passes through Tennessee's three largest cities—Memphis, Nashville, and Knoxville—and serves the Great Smoky Mountains National Park, the most-visited national park in the U.S. Built in segments, I-40 in Tennessee was mostly complete by the late 1960s. The construction of the highway resulted in the U.S. Supreme Court decision, Citizens to Preserve Overton Park v. Volpe (1971), increasing the scope for judicial review of administrative actions, in this case the route I-40 would take through Memphis. The case caused the state to realign I-40's route onto what was originally a section of I-240. (Full article...)